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 </pre><pre class="rust"><code><span class="doccomment">//! Debug Logging
 //!
 //! To use in a debug build, set the env var `RAYON_LOG` as
 //! described below.  In a release build, logs are compiled out by
 //! default unless Rayon is built with `--cfg rayon_rs_log` (try
 //! `RUSTFLAGS=&quot;--cfg rayon_rs_log&quot;`).
 //!
 //! Note that logs are an internally debugging tool and their format
 //! is considered unstable, as are the details of how to enable them.
 //!
 //! # Valid values for RAYON_LOG
 //!
 //! The `RAYON_LOG` variable can take on the following values:
 //!
 //! * `tail:&lt;file&gt;` -- dumps the last 10,000 events into the given file;
 //!   useful for tracking down deadlocks
 //! * `profile:&lt;file&gt;` -- dumps only those events needed to reconstruct how
 //!   many workers are active at a given time
 //! * `all:&lt;file&gt;` -- dumps every event to the file; useful for debugging

 </span><span class="kw">use </span>crossbeam_channel::{<span class="self">self</span>, Receiver, Sender};
 <span class="kw">use </span>std::collections::VecDeque;
 <span class="kw">use </span>std::env;
 <span class="attribute">#[cfg(not(target_vendor = <span class="string">&quot;teaclave&quot;</span>))]
 </span><span class="kw">use </span>std::fs::File;
 <span class="comment">// Logger is disbaled in teaclave, use the untrusted fs for compilation
 </span><span class="kw">use </span>std::io::{<span class="self">self</span>, BufWriter, Write};
 <span class="attribute">#[cfg(target_vendor = <span class="string">&quot;teaclave&quot;</span>)]
 </span><span class="kw">use </span>std::untrusted::fs::File;

 <span class="doccomment">/// True if logs are compiled in.
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">const </span>LOG_ENABLED: bool = <span class="macro">cfg!</span>(any(
     rayon_rs_log,
     debug_assertions,
     target_vendor = <span class="string">&quot;teaclave&quot;
 </span>));

 <span class="attribute">#[derive(Copy, Clone, PartialOrd, Ord, PartialEq, Eq, Debug)]
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">enum </span>Event {
     <span class="doccomment">/// Flushes events to disk, used to terminate benchmarking.
     </span>Flush,

     <span class="doccomment">/// Indicates that a worker thread started execution.
     </span>ThreadStart {
         worker: usize,
         terminate_addr: usize,
     },

     <span class="doccomment">/// Indicates that a worker thread started execution.
     </span>ThreadTerminate { worker: usize },

     <span class="doccomment">/// Indicates that a worker thread became idle, blocked on `latch_addr`.
     </span>ThreadIdle { worker: usize, latch_addr: usize },

     <span class="doccomment">/// Indicates that an idle worker thread found work to do, after
     /// yield rounds. It should no longer be considered idle.
     </span>ThreadFoundWork { worker: usize, yields: u32 },

     <span class="doccomment">/// Indicates that a worker blocked on a latch observed that it was set.
     ///
     /// Internal debugging event that does not affect the state
     /// machine.
     </span>ThreadSawLatchSet { worker: usize, latch_addr: usize },

     <span class="doccomment">/// Indicates that an idle worker is getting sleepy. `sleepy_counter` is the internal
     /// sleep state that we saw at the time.
     </span>ThreadSleepy { worker: usize, jobs_counter: usize },

     <span class="doccomment">/// Indicates that the thread&#39;s attempt to fall asleep was
     /// interrupted because the latch was set. (This is not, in and of
     /// itself, a change to the thread state.)
     </span>ThreadSleepInterruptedByLatch { worker: usize, latch_addr: usize },

     <span class="doccomment">/// Indicates that the thread&#39;s attempt to fall asleep was
     /// interrupted because a job was posted. (This is not, in and of
     /// itself, a change to the thread state.)
     </span>ThreadSleepInterruptedByJob { worker: usize },

     <span class="doccomment">/// Indicates that an idle worker has gone to sleep.
     </span>ThreadSleeping { worker: usize, latch_addr: usize },

     <span class="doccomment">/// Indicates that a sleeping worker has awoken.
     </span>ThreadAwoken { worker: usize, latch_addr: usize },

     <span class="doccomment">/// Indicates that the given worker thread was notified it should
     /// awaken.
     </span>ThreadNotify { worker: usize },

     <span class="doccomment">/// The given worker has pushed a job to its local deque.
     </span>JobPushed { worker: usize },

     <span class="doccomment">/// The given worker has popped a job from its local deque.
     </span>JobPopped { worker: usize },

     <span class="doccomment">/// The given worker has stolen a job from the deque of another.
     </span>JobStolen { worker: usize, victim: usize },

     <span class="doccomment">/// N jobs were injected into the global queue.
     </span>JobsInjected { count: usize },

     <span class="doccomment">/// A job was removed from the global queue.
     </span>JobUninjected { worker: usize },

     <span class="doccomment">/// A job was broadcasted to N threads.
     </span>JobBroadcast { count: usize },

     <span class="doccomment">/// When announcing a job, this was the value of the counters we observed.
     ///
     /// No effect on thread state, just a debugging event.
     </span>JobThreadCounts {
         worker: usize,
         num_idle: u16,
         num_sleepers: u16,
     },
 }

 <span class="doccomment">/// Handle to the logging thread, if any. You can use this to deliver
 /// logs. You can also clone it freely.
 </span><span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>Logger {
     sender: <span class="prelude-ty">Option</span>&lt;Sender&lt;Event&gt;&gt;,
 }

 <span class="kw">impl </span>Logger {
     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(num_workers: usize) -&gt; Logger {
         <span class="kw">if </span>!LOG_ENABLED {
             <span class="kw">return </span><span class="self">Self</span>::disabled();
         }

         <span class="comment">// see the doc comment for the format
         </span><span class="kw">let </span>env_log = <span class="kw">match </span>env::var(<span class="string">&quot;RAYON_LOG&quot;</span>) {
             <span class="prelude-val">Ok</span>(s) =&gt; s,
             <span class="prelude-val">Err</span>(<span class="kw">_</span>) =&gt; <span class="kw">return </span><span class="self">Self</span>::disabled(),
         };

         <span class="kw">let </span>(sender, receiver) = crossbeam_channel::unbounded();

         <span class="kw">if let </span><span class="prelude-val">Some</span>(filename) = env_log.strip_prefix(<span class="string">&quot;tail:&quot;</span>) {
             <span class="kw">let </span>filename = filename.to_string();
             ::std::thread::spawn(<span class="kw">move </span>|| {
                 <span class="self">Self</span>::tail_logger_thread(num_workers, filename, <span class="number">10_000</span>, receiver)
             });
         } <span class="kw">else if </span>env_log == <span class="string">&quot;all&quot; </span>{
             ::std::thread::spawn(<span class="kw">move </span>|| <span class="self">Self</span>::all_logger_thread(num_workers, receiver));
         } <span class="kw">else if let </span><span class="prelude-val">Some</span>(filename) = env_log.strip_prefix(<span class="string">&quot;profile:&quot;</span>) {
             <span class="kw">let </span>filename = filename.to_string();
             ::std::thread::spawn(<span class="kw">move </span>|| {
                 <span class="self">Self</span>::profile_logger_thread(num_workers, filename, <span class="number">10_000</span>, receiver)
             });
         } <span class="kw">else </span>{
             <span class="macro">panic!</span>(<span class="string">&quot;RAYON_LOG should be &#39;tail:&lt;file&gt;&#39; or &#39;profile:&lt;file&gt;&#39;&quot;</span>);
         }

         Logger {
             sender: <span class="prelude-val">Some</span>(sender),
         }
     }

     <span class="kw">fn </span>disabled() -&gt; Logger {
         Logger { sender: <span class="prelude-val">None </span>}
     }

     <span class="attribute">#[inline]
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>log(<span class="kw-2">&amp;</span><span class="self">self</span>, event: <span class="kw">impl </span>FnOnce() -&gt; Event) {
         <span class="kw">if </span>!LOG_ENABLED {
             <span class="kw">return</span>;
         }

         <span class="kw">if let </span><span class="prelude-val">Some</span>(sender) = <span class="kw-2">&amp;</span><span class="self">self</span>.sender {
             sender.send(event()).unwrap();
         }
     }

     <span class="kw">fn </span>profile_logger_thread(
         num_workers: usize,
         log_filename: String,
         capacity: usize,
         receiver: Receiver&lt;Event&gt;,
     ) {
         <span class="kw">let </span>file = File::create(<span class="kw-2">&amp;</span>log_filename)
             .unwrap_or_else(|err| <span class="macro">panic!</span>(<span class="string">&quot;failed to open `{}`: {}&quot;</span>, log_filename, err));

         <span class="kw">let </span><span class="kw-2">mut </span>writer = BufWriter::new(file);
         <span class="kw">let </span><span class="kw-2">mut </span>events = Vec::with_capacity(capacity);
         <span class="kw">let </span><span class="kw-2">mut </span>state = SimulatorState::new(num_workers);
         <span class="kw">let </span>timeout = std::time::Duration::from_secs(<span class="number">30</span>);

         <span class="kw">loop </span>{
             <span class="kw">while let </span><span class="prelude-val">Ok</span>(event) = receiver.recv_timeout(timeout) {
                 <span class="kw">if let </span>Event::Flush = event {
                     <span class="kw">break</span>;
                 }

                 events.push(event);
                 <span class="kw">if </span>events.len() == capacity {
                     <span class="kw">break</span>;
                 }
             }

             <span class="kw">for </span>event <span class="kw">in </span>events.drain(..) {
                 <span class="kw">if </span>state.simulate(<span class="kw-2">&amp;</span>event) {
                     state.dump(<span class="kw-2">&amp;mut </span>writer, <span class="kw-2">&amp;</span>event).unwrap();
                 }
             }

             writer.flush().unwrap();
         }
     }

     <span class="kw">fn </span>tail_logger_thread(
         num_workers: usize,
         log_filename: String,
         capacity: usize,
         receiver: Receiver&lt;Event&gt;,
     ) {
         <span class="kw">let </span>file = File::create(<span class="kw-2">&amp;</span>log_filename)
             .unwrap_or_else(|err| <span class="macro">panic!</span>(<span class="string">&quot;failed to open `{}`: {}&quot;</span>, log_filename, err));

         <span class="kw">let </span><span class="kw-2">mut </span>writer = BufWriter::new(file);
         <span class="kw">let </span><span class="kw-2">mut </span>events: VecDeque&lt;Event&gt; = VecDeque::with_capacity(capacity);
         <span class="kw">let </span><span class="kw-2">mut </span>state = SimulatorState::new(num_workers);
         <span class="kw">let </span>timeout = std::time::Duration::from_secs(<span class="number">30</span>);
         <span class="kw">let </span><span class="kw-2">mut </span>skipped = <span class="bool-val">false</span>;

         <span class="kw">loop </span>{
             <span class="kw">while let </span><span class="prelude-val">Ok</span>(event) = receiver.recv_timeout(timeout) {
                 <span class="kw">if let </span>Event::Flush = event {
                     <span class="comment">// We ignore Flush events in tail mode --
                     // we&#39;re really just looking for
                     // deadlocks.
                     </span><span class="kw">continue</span>;
                 } <span class="kw">else </span>{
                     <span class="kw">if </span>events.len() == capacity {
                         <span class="kw">let </span>event = events.pop_front().unwrap();
                         state.simulate(<span class="kw-2">&amp;</span>event);
                         skipped = <span class="bool-val">true</span>;
                     }

                     events.push_back(event);
                 }
             }

             <span class="kw">if </span>skipped {
                 <span class="macro">writeln!</span>(writer, <span class="string">&quot;...&quot;</span>).unwrap();
                 skipped = <span class="bool-val">false</span>;
             }

             <span class="kw">for </span>event <span class="kw">in </span>events.drain(..) {
                 <span class="comment">// In tail mode, we dump *all* events out, whether or
                 // not they were &#39;interesting&#39; to the state machine.
                 </span>state.simulate(<span class="kw-2">&amp;</span>event);
                 state.dump(<span class="kw-2">&amp;mut </span>writer, <span class="kw-2">&amp;</span>event).unwrap();
             }

             writer.flush().unwrap();
         }
     }

     <span class="kw">fn </span>all_logger_thread(num_workers: usize, receiver: Receiver&lt;Event&gt;) {
         <span class="kw">let </span>stderr = std::io::stderr();
         <span class="kw">let </span><span class="kw-2">mut </span>state = SimulatorState::new(num_workers);

         <span class="kw">for </span>event <span class="kw">in </span>receiver {
             <span class="kw">let </span><span class="kw-2">mut </span>writer = BufWriter::new(stderr.lock());
             state.simulate(<span class="kw-2">&amp;</span>event);
             state.dump(<span class="kw-2">&amp;mut </span>writer, <span class="kw-2">&amp;</span>event).unwrap();
             writer.flush().unwrap();
         }
     }
 }

 <span class="attribute">#[derive(Copy, Clone, PartialOrd, Ord, PartialEq, Eq, Debug)]
 </span><span class="kw">enum </span>State {
     Working,
     Idle,
     Notified,
     Sleeping,
     Terminated,
 }

 <span class="kw">impl </span>State {
     <span class="kw">fn </span>letter(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; char {
         <span class="kw">match </span><span class="self">self </span>{
             State::Working =&gt; <span class="string">&#39;W&#39;</span>,
             State::Idle =&gt; <span class="string">&#39;I&#39;</span>,
             State::Notified =&gt; <span class="string">&#39;N&#39;</span>,
             State::Sleeping =&gt; <span class="string">&#39;S&#39;</span>,
             State::Terminated =&gt; <span class="string">&#39;T&#39;</span>,
         }
     }
 }

 <span class="kw">struct </span>SimulatorState {
     local_queue_size: Vec&lt;usize&gt;,
     thread_states: Vec&lt;State&gt;,
     injector_size: usize,
 }

 <span class="kw">impl </span>SimulatorState {
     <span class="kw">fn </span>new(num_workers: usize) -&gt; <span class="self">Self </span>{
         <span class="self">Self </span>{
             local_queue_size: (<span class="number">0</span>..num_workers).map(|<span class="kw">_</span>| <span class="number">0</span>).collect(),
             thread_states: (<span class="number">0</span>..num_workers).map(|<span class="kw">_</span>| State::Working).collect(),
             injector_size: <span class="number">0</span>,
         }
     }

     <span class="kw">fn </span>simulate(<span class="kw-2">&amp;mut </span><span class="self">self</span>, event: <span class="kw-2">&amp;</span>Event) -&gt; bool {
         <span class="kw">match </span><span class="kw-2">*</span>event {
             Event::ThreadIdle { worker, .. } =&gt; {
                 <span class="macro">assert_eq!</span>(<span class="self">self</span>.thread_states[worker], State::Working);
                 <span class="self">self</span>.thread_states[worker] = State::Idle;
                 <span class="bool-val">true
             </span>}

             Event::ThreadStart { worker, .. } | Event::ThreadFoundWork { worker, .. } =&gt; {
                 <span class="self">self</span>.thread_states[worker] = State::Working;
                 <span class="bool-val">true
             </span>}

             Event::ThreadTerminate { worker, .. } =&gt; {
                 <span class="self">self</span>.thread_states[worker] = State::Terminated;
                 <span class="bool-val">true
             </span>}

             Event::ThreadSleeping { worker, .. } =&gt; {
                 <span class="macro">assert_eq!</span>(<span class="self">self</span>.thread_states[worker], State::Idle);
                 <span class="self">self</span>.thread_states[worker] = State::Sleeping;
                 <span class="bool-val">true
             </span>}

             Event::ThreadAwoken { worker, .. } =&gt; {
                 <span class="macro">assert_eq!</span>(<span class="self">self</span>.thread_states[worker], State::Notified);
                 <span class="self">self</span>.thread_states[worker] = State::Idle;
                 <span class="bool-val">true
             </span>}

             Event::JobPushed { worker } =&gt; {
                 <span class="self">self</span>.local_queue_size[worker] += <span class="number">1</span>;
                 <span class="bool-val">true
             </span>}

             Event::JobPopped { worker } =&gt; {
                 <span class="self">self</span>.local_queue_size[worker] -= <span class="number">1</span>;
                 <span class="bool-val">true
             </span>}

             Event::JobStolen { victim, .. } =&gt; {
                 <span class="self">self</span>.local_queue_size[victim] -= <span class="number">1</span>;
                 <span class="bool-val">true
             </span>}

             Event::JobsInjected { count } =&gt; {
                 <span class="self">self</span>.injector_size += count;
                 <span class="bool-val">true
             </span>}

             Event::JobUninjected { .. } =&gt; {
                 <span class="self">self</span>.injector_size -= <span class="number">1</span>;
                 <span class="bool-val">true
             </span>}

             Event::ThreadNotify { worker } =&gt; {
                 <span class="comment">// Currently, this log event occurs while holding the
                 // thread lock, so we should *always* see it before
                 // the worker awakens.
                 </span><span class="macro">assert_eq!</span>(<span class="self">self</span>.thread_states[worker], State::Sleeping);
                 <span class="self">self</span>.thread_states[worker] = State::Notified;
                 <span class="bool-val">true
             </span>}

             <span class="comment">// remaining events are no-ops from pov of simulating the
             // thread state
             </span><span class="kw">_ </span>=&gt; <span class="bool-val">false</span>,
         }
     }

     <span class="kw">fn </span>dump(<span class="kw-2">&amp;mut </span><span class="self">self</span>, w: <span class="kw-2">&amp;mut </span><span class="kw">impl </span>Write, event: <span class="kw-2">&amp;</span>Event) -&gt; io::Result&lt;()&gt; {
         <span class="kw">let </span>num_idle_threads = <span class="self">self
             </span>.thread_states
             .iter()
             .filter(|s| <span class="kw-2">**</span>s == State::Idle)
             .count();

         <span class="kw">let </span>num_sleeping_threads = <span class="self">self
             </span>.thread_states
             .iter()
             .filter(|s| <span class="kw-2">**</span>s == State::Sleeping)
             .count();

         <span class="kw">let </span>num_notified_threads = <span class="self">self
             </span>.thread_states
             .iter()
             .filter(|s| <span class="kw-2">**</span>s == State::Notified)
             .count();

         <span class="kw">let </span>num_pending_jobs: usize = <span class="self">self</span>.local_queue_size.iter().sum();

         <span class="macro">write!</span>(w, <span class="string">&quot;{:2},&quot;</span>, num_idle_threads)<span class="question-mark">?</span>;
         <span class="macro">write!</span>(w, <span class="string">&quot;{:2},&quot;</span>, num_sleeping_threads)<span class="question-mark">?</span>;
         <span class="macro">write!</span>(w, <span class="string">&quot;{:2},&quot;</span>, num_notified_threads)<span class="question-mark">?</span>;
         <span class="macro">write!</span>(w, <span class="string">&quot;{:4},&quot;</span>, num_pending_jobs)<span class="question-mark">?</span>;
         <span class="macro">write!</span>(w, <span class="string">&quot;{:4},&quot;</span>, <span class="self">self</span>.injector_size)<span class="question-mark">?</span>;

         <span class="kw">let </span>event_str = <span class="macro">format!</span>(<span class="string">&quot;{:?}&quot;</span>, event);
         <span class="macro">write!</span>(w, <span class="string">r#&quot;&quot;{:60}&quot;,&quot;#</span>, event_str)<span class="question-mark">?</span>;

         <span class="kw">for </span>((i, state), queue_size) <span class="kw">in </span>(<span class="number">0</span>..).zip(<span class="kw-2">&amp;</span><span class="self">self</span>.thread_states).zip(<span class="kw-2">&amp;</span><span class="self">self</span>.local_queue_size) {
             <span class="macro">write!</span>(w, <span class="string">&quot; T{:02},{}&quot;</span>, i, state.letter(),)<span class="question-mark">?</span>;

             <span class="kw">if </span><span class="kw-2">*</span>queue_size &gt; <span class="number">0 </span>{
                 <span class="macro">write!</span>(w, <span class="string">&quot;,{:03},&quot;</span>, queue_size)<span class="question-mark">?</span>;
             } <span class="kw">else </span>{
                 <span class="macro">write!</span>(w, <span class="string">&quot;,   ,&quot;</span>)<span class="question-mark">?</span>;
             }
         }

         <span class="macro">writeln!</span>(w)<span class="question-mark">?</span>;
         <span class="prelude-val">Ok</span>(())
     }
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="rayon_core" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>